Pump output regulator



Jan. 30, 1940.' J. MERCIER v `PUMP OUTPUT REGULATOR Filed Dec. I9, 1957 Tenn Nercr INVEN-rca@ Patented Jan. 30, 1940 2,188,463 l PUMP' OUTPUT REGULATOR Jean Mercier, Neuilly-sur-Seine, France Application December 9, 1937, Serial No. 178,850 I In France September 27,- 1937 6 Claims.

It is a known fact that the Output of a pump', a compressor, or the like, which is mounted for instance in the circuit of a uid, is usually regulated by a check-valve or slide-valve which is subjected on one side to the pressure of the fluid delivered by the pump and on the other side to an elastic antagonistic force of any kind. With the use oi such valves, the pressure o'i the uid discharged by the pump will act against the l0 spring, and when this pressure assumes a dangerous value, the liquid will drive out the valve and will place the pump in short-circuit. If` .the pressure should be slightly reduced, the said spring will separate the pump from the discharge conduit. In consequence, the valve will never be operated in a positive manner for the complete opening of the discharge conduit in order to relieve the pump, which continues to operate by abrupt impulses and is always subjected to the pressure of the circuit of utilization.

The present invention has for its object to obviate this drawback, and it relates to an apparatus which is characterized in that it com'- prises a. valve. device such as a check-valve, a

slide-valve or the like, adapted to short-circuit the pump, compressor or the like, or to connect them to the discharge end, said device being subjected on onel side to the pressure of the 80 liquid delivered by the pump, and on the other side to the eect of an elastic antagonistic force, as well as 4an auxiliary device acting upon the said valve device and subjected on one side to the effect of the pressure of the fluid delivered of the pressure in the conduit Oi' utilization, the

area of this latter surface being at least lequal to the area ofthe face of the valve device sub- -iecterl tothe pressure of theiiuid delivered by 40 the pump or the like. v In this manner, when the pressure of the iluid.

discharged by the pump attains a certain limit,

itwill first drive the valve and thus connect the pump to the discharge end, At this time, the pressure inthe conduit of utilization acts upon the auxiliary device, which is driven back with great force and causes the sudden and complete by the pump, and on the other side to the eiect iiuid discharged by the pump, and of thefluid in the conduit of utilization.

When this limit is attained, the apparatus returns to the initial position, andthe pump, after it has been effectively relieved, will then recommence its normal delivery. Y

Thev accompanying drawing, which is given solely by way of example, represents a longitudinal section of a constructional form of an apparatus according to the invention.

In the present embodiment, the apparatus comprises a main fra-me I having atubular part 2 which is closed, for instance, by a cap 3, as well as a coupling neck 4 which is connected to the pump, compressor or like apparatus, also a coupling neck 5 which is connected to the dischargeconduit, and a neck 6 which is connected to the conduit of utilization. The neck 6 may. be provided with a tubular device 'I which is directly connected to the said conduit of utilization. Obviously, the conduit 1 might also lead to an accumulator of any suitable type.

The part 2 contains a valve 8 having a part oi' large diameter' 8a, as lwell as a part 8b of smaller diameter, and another part 8c of a still smallerA diameter. The part 8a' may be acted upon by an elastic reaction device 9 of any suitable type. When the said Valve is actuated against the vdevice 9, it connects the conduit 4 with the conduit 5, through the space and the channel 5a.

Inline with the valve 8 is mounted an auxiliary member lll comprising a part having a relatively large cross section. The area of this section is preferably vgreater than the area of the section of 8b. The member I0 contains channels II and I2 which make connection between the conduits 4 and 1. The channel .I2 may be closed by a check-valve which consists, for example, of .a ball I3 provided with a spring I4. 40

The operation of the said apparatus is as' follows: In normal working, the pump discharges through the conduits 4 and the conduits II, I2 and l. When thev pressure of the discharged fluid exceeds a certain limit determined by the spring il, the valve 8 is driven to the left (according to the ligure), thus placingthe pump in short-circuit or on the discharge, owing tothe connection between the conduit 4, the space 5a and the conduit 5. iIn consequence, the pres' sure in the conduit 4 will suddently fall. However, the pressure in the conduit 'l remains the same as the pressure prevailingin the accu-` mulator or in .the conduit of utilization. It is 5 exerted upon the member Ita oi the device l0,

which is thus strongly driven to the left, and gives a sharp stroke to the member lc of the valve, which latter will be entirely opened. As 5 long as the pressure in the conduit JI exerted upon the surface Ilia remains above a certain limit, the pump will not deliver into the conduit of utilization. Thus, for instance, if it is admitted that the limit of pressure for the pump v10 is fixed at 250 kgs. per sq. cm., and also, that the surfaces 8b and Illa have the diameters of 8 and 9 mm. respectively, it is observed that the valve 8 will remain open as long as the pressure in the conduit ,of utilization or in the accumulator does not fall below 200 kgs. approximately. In such case, the member I0 will be strongly driven to the right (according to the figure); the valve 8 will now cut 0E the pump lfrom the conduit 5, and the plant may continue on its normal operation.

Owing to this arrangement, the pump is actually relieved by connecting it with the discharge end for a certain time, or by placing it in shortcircuit.

u Obviously, the said invention is not limited to the embodiments herein described and represented, which are given solely by way of example.

For instance. the two valve parts 8 and 10 might be combined in a single piece; in this case, it is the greater section of the part I 0 which again provides for the positive driving of nie slidevalve device, when the pressure in the hydraulic circuit attains the limiting value.

Having now described my invention, what I Patent is: i l

l. A device for the regulation of the output of a pump, compressor or like apparatus, comprising an obturating member adapted to control the flow of fluid of said apparatus, and sub- -jected on one side to the action of the pressure of the fluid delivered by the apparatus and on the other side tothe effect of an elastic reaction stress, and an auxiliary element acting upon said obturating member and subjected on one of its faces to the action of the delivery pressure and on the other face to the action of the pressure in the utilization conduit, the area of said latter face being at least equal to the area of the face of the obturating member subjected to the delivery pressure in said apparatus. f

2. A device for the regulation of the output of a pump; compressor or like apparatus,. compris- `lng an obturating member adapted to short-cir- 55 cuit said apparatus, and subjected on one side to the action of the pressure of the fluid delivered by the apparatus and on the other side to the effect of an elasticreaction stress, and an auxiliary eleclaim vas new and desire to secure by Letters.

3. A device for the regulation of the output of a pump, compressor or like apparatus, comprising an obturating member adapted to connect said apparatus with the outlet, and subjected on one side to the action of the pressure of the fluid delivered by the apparatus and on the other -side to the eect of an elastic reaction stress,4 and an auxiliary element acting upon said obturating member and subjected on one of its faces to the action of thedelivery'pressure and on the other face to the action of the pressure in the utilization conduit, the area of said latter face being at least equal to the area of the face of the obturating member subjected to the delivery pressure in said apparatus.

4. A device according to claim l wherein said auxiliary element is disposed in line with said obturating member and comprises channel means and retaining means which ensure in normal conditions the connection of the delivery of said apparatus with the usual elements of utilization.

5. A deviceof the kind above referred to, comprising a casing connected with the delivery of the action Vof said delivery pressure and on the other side to the action of the pressure inthe conduit of utilization, the areaof the face of said elementV subjected to the utilization pressure being at least equal to the area of the face of said vobturating member subjected to the delivery pressure of the fluid, channel means in said casing for connecting-the delivery of the apparatus with the outlet, said channel means being controlled by said obturating member, and further channel means connecting said delivery with the conduit of utilization. V

'6. A device of the kind above referred to, comprising an obturating member subjected on one face to the delivery pressure of the apparatus such as a pump, elastic reaction means acting on the second face of said member, an auxiliary preferably independent element disposed in line with said member adapted to come into contact with said member, so that said auxiliary element can give a sharp stroke to .said member, and subjected on one of its faces to the'action of pressure in the utilization conduit and on the other face to the action of the delivery pressure, and a casing containing said different elements and connected to the delivery of said apparatus, to the outlet and to the conduit o'f utilization, the area of the face of said auxiliary element subjected to the utilization pressure being at least equal to the .area of the face of said obturating member subjected to the delivery pressure of the fluid.

JEAN MERCIER. 

